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Small leaks between lower unit and upper unit

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  • Small leaks between lower unit and upper unit

    Hi,

    I have an Evinrude/Johnson 100hp 4 cylinder 1983 model that I have a question on:

    When I pulled it out yesterday to run the motor using muffs, I noticed about 3 pinhole sized water leaks on the left side where the lower unit meets the upper unit. There were I believe another 2 on the right side. They would squirt water either at idle or at 3000 - 4000 RPMs.

    Is this a problem or can I continue to run it that way? If it's serious, what kind of effort will there be to fix it? I also saw what appeared to be an "intentional" hole at the front of the upper unit that also squirted although it looks like that hole should be there. Other place it was shooting water out of was the fin holes but I think that are also intakes? Don't know for sure, could be muffler exhausts?

    Any help on the pinholes really appreciated. My primare use is saltwater fishing.

    Hank

  • #2
    Re: Small leaks between lower unit and upper unit

    First off, you shouldn't be running the mtr at 3000-4000 rpms on muffs unless you want some internal part to come out and say "Hello". As long as the mtr isn't overheating this is perfectly normal.

    Comment


    • #3
      Re: Small leaks between lower unit and upper unit

      Stupid question but.... Why can't he run it at whatever RPMS he wants as long as it's on water?

      As far as the water "leak" are you sure you don't have too much pressure running from the hose to the motor? It doesn't require but like 15 PSI, but the average house has like 50 pounds of water pressure. Too much pressure will cause the water to come out of other areas, and isn't a good idea.

      Comment


      • #4
        Re: Small leaks between lower unit and upper unit

        Reread above ... like the motor might blow up! The joint between the LU and midsection is not sealed. Dumping WAG's here is not helpful.
        Jim

        ===============================
        I don't respond to Private Messages PM's that are motor questions.

        For basic information on a wide range of topics, see Top Secret File
        Link: http://forums.iboats.com/showthread.php?t=299680

        OEM shop manual: outboardbooks.com or Ebay

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        • #5
          Re: Small leaks between lower unit and upper unit

          Jim311, he said he was running on "MUFFS". Not in the water.

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          • #6
            Re: Small leaks between lower unit and upper unit

            Judging from all the return posts, I may have too much pressure on the muffs and shouldn't be running the rpms so high. I guess the consensus if I keep using the motor in the water (letting the pump suck in the water) it should be ok?

            Please let me know, I'd hate to blow the motor as it's a commercial grade motor and runs good.

            Thanks to all.

            Hank

            Originally posted by Hank Bass View Post
            Hi,

            I have an Evinrude/Johnson 100hp 4 cylinder 1983 model that I have a question on:

            When I pulled it out yesterday to run the motor using muffs, I noticed about 3 pinhole sized water leaks on the left side where the lower unit meets the upper unit. There were I believe another 2 on the right side. They would squirt water either at idle or at 3000 - 4000 RPMs.

            Is this a problem or can I continue to run it that way? If it's serious, what kind of effort will there be to fix it? I also saw what appeared to be an "intentional" hole at the front of the upper unit that also squirted although it looks like that hole should be there. Other place it was shooting water out of was the fin holes but I think that are also intakes? Don't know for sure, could be muffler exhausts?

            Any help on the pinholes really appreciated. My primare use is saltwater fishing.

            Hank

            Comment


            • #7
              Re: Small leaks between lower unit and upper unit

              If you are the type of person that it bothers, drop the lower unit and clean the mating sections, or you can just run it and not worry about it.

              Comment


              • #8
                Re: Small leaks between lower unit and upper unit

                Just to be clear, the engine shouldn't be revved like that even IN water, in neutral. The engine needs to be in gear when revving up that high. A neutral no-load rev that high isn't good.
                1997 Ruffnek 160 (Ranger 320v clone)
                1997 115 Evinrude Intruder V4

                Comment


                • #9
                  Re: Small leaks between lower unit and upper unit

                  Thanks to all for the help. I'd rate this forum as tops of any website. Everytime I've had a problem, all the posters have hit the problem right on the head. Thanks again.

                  Comment


                  • #10
                    Re: Small leaks between lower unit and upper unit

                    Thanks Seaman!!

                    Hank

                    Comment


                    • #11
                      Re: Small leaks between lower unit and upper unit

                      Thanks Cap!

                      Hank

                      Comment


                      • #12
                        Re: Small leaks between lower unit and upper unit

                        I don't know if you've pulled the gearcase off before, but if you do, you'll see it's all open in there. No gasket between the lower unit and the midsection. Free flowing water.

                        Comment


                        • #13
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                          Re: Small leaks between lower unit and upper unit

                          Never/ever run the motor past idle on muffs. Muffs are only making sure the motor runs.
                          High Revs on Muffs is BAD.

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